Determining Reasonable Answer Worksheet With Answer Key Page 8

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Answer Key
Name:
Determining Reasonable Answer
Determine if the answer shown is reasonable (yes) or not (no).
A n s w e r s
yes
Anything times 2 HAS to end in an even number (2,4,6,8,0).
Ex. 2 × 6 = 12
2 × 13 = 26
1.
yes
Anything times 5 HAS to end in an either a 5 or a 0.
Ex. 5 × 4 = 20
5 × 15 = 75
2.
no
3.
Anything times 10 HAS to end in a 0.
Ex. 10 × 7 = 70
10 × 16 = 160
yes
4.
1) 728 × 2 = 1,456
2) 906 × 2 = 1,812
yes
5.
no
6.
3) 5 × 504 = 2,522
4) 807 × 5 = 4,035
yes
7.
5) 2 × 926 = 1,852
6) 505 × 10 = 5,051
yes
8.
no
7) 5 × 168 = 840
8) 10 × 499 = 4,990
9.
yes
10.
9) 10 × 941 = 9,411
10) 809 × 10 = 8,090
no
11.
11) 224 × 5 = 1,122
12) 2 × 469 = 938
yes
12.
no
13.
13) 674 × 10 = 6,743
14) 724 × 2 = 1,449
no
14.
15) 10 × 937 = 9,372
16) 117 × 2 = 235
no
15.
no
16.
17) 375 × 5 = 1,879
18) 10 × 683 = 6,830
no
17.
19) 5 × 592 = 2,960
20) 437 × 2 = 875
yes
18.
yes
19.
no
20.
1-10 95 90 85 80 75 70 65 60 55 50
4
Math
11-20 45 40 35 30 25 20 15 10 5
0

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